Propeller arrangement for marine vehicles

Abstract

The present invention relates to a marine propeller arrangement comprising a propeller communicating with a shaft connected to the motor of a marine vehicle, the propeller having a hub and demountable blades, wherein each blade comprises a hub portion being integral with each blade and having plurality of bores for securing thereof; and the arrangement comprises a sleeve having a shaft receiving bore, wherein each hub portion is supported by the sleeve and secured thereto via a plurality of securing elements.

What is claimed is: 
     
       1. A marine propeller arrangement comprising a propeller communicating with a shaft connected to a motor of a marine vehicle, the propeller having a hub and demountable blades, wherein each blade comprises a hub portion being integral therewith and each hub portion of each blade having plurality of bores for connecting thereof; and the arrangement comprises a sleeve having a shaft receiving bore, wherein each hub portion is supported by the sleeve and secured thereto via a plurality of securing elements, wherein the sleeve comprises a cylindrical portion to which each hub portion is secured, and a cylindrical hub supporting portion extending axially from the cylindrical portion, wherein each hub portion is seated on the cylindrical hub supporting portion, and wherein the cylindrical portion of the sleeve comprises a circular sleeve protrusion being coaxial thereto and extending axially along the hub supporting portion. 
     
     
       2. The marine propeller arrangement according to  claim 1 , wherein the marine vehicle shaft comprises a tapered portion, and the shaft receiving bore comprises a tapered form compatible with the shaft tapered portion for fitting the sleeve on the tapered portion. 
     
     
       3. The marine propeller arrangement according to  claim 1 , wherein each hub portion comprises a first mating surface, and a second mating surface, wherein the mating surfaces are arcuate and oppositely extend along the lateral surfaces of the hub portion. 
     
     
       4. The marine propeller arrangement according to  claim 3 , wherein the first mating surface is provided with protrusions extending outwardly from the surface, and the second mating surface is provided with recesses extending inwardly from the surface. 
     
     
       5. The marine propeller arrangement according to  claim 4 , wherein each hub portion comprises a hub recess extending circumferentially in the shaft radial direction. 
     
     
       6. The marine propeller arrangement according to  claim 5 , further comprising hub securing bores linearly formed parallel to the shaft axis along the hub portion starting from the surface of each hub recess. 
     
     
       7. The marine propeller arrangement according to  claim 1 , further comprising sleeve securing bores extending along the thickness of the cylindrical portion of the sleeve. 
     
     
       8. The marine propeller arrangement according to  claim 7 , further comprising mass balancing openings extending along the thickness of the sleeve cylindrical portion. 
     
     
       9. The marine propeller arrangement according to  claim 1 , further comprising a cylindrical collar supporting portion formed on the end portion of the hub supporting portion of the sleeve; and a connection collar fitted on said cylindrical collar supporting portion. 
     
     
       10. The marine propeller arrangement according to  claim 9 , wherein the connection collar comprises circular connection collar protrusions protruding axially on both opposing circular surfaces thereof; and connection collar bores extending along the thickness of the connection collar. 
     
     
       11. The marine propeller arrangement according to  claim 1 , wherein each hub portion comprises three securing bores for securing thereof by means of three separate hub securing elements. 
     
     
       12. The marine propeller arrangement according to  claim 11 , wherein at least one common securing element secures more than one hub portion.